Add more test cases for bindImageTexture Add cases that bindImageTexture binds a single layer of a two-dimensional array, three-dimensional, or cube map texture. BUG=angleproject:1987 TEST=angle_end2end_tests.ComputeShaderTest.* Change-Id: I75883ef05c509100e5164a5add69167a41203101 Reviewed-on: https://chromium-review.googlesource.com/856320 Commit-Queue: Geoff Lang <geofflang@chromium.org> Reviewed-by: Corentin Wallez <cwallez@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org>